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Message-ID: <20050804000305.6364.qmail@web40825.mail.yahoo.com>
Date: 2005-08-04T00:03:05Z
From: array chip
Subject: color palette

Hi, I have a matrix with both positive and negative
numbers, I would like to use image() to draw a
heatmap. How can I can design a palette (or is there a
function already available) that treat negative
numbers in a blue gradient and positive numbers in a
red gradient and treat 0 as white?

Thanks